高的工作电压高达100V N双N沟道MOSFET同步驱动 The D810DCDC is a synchronous step-down switching regulator controllER that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The D810DCDC uses a constant on-time valley current control architecture to delivER vERy low duty cycles with accurate cycle-by-cycle current limit, without requiring a sense resistor. A precise intERnal refERence provides 0.5% DC accuracy. A high bandwidth (25MHz) ERror amplifi ER provides vERy fast line and load transient response. Large 1Ω gate drivERs allow the D810DCDC to drive multiple MOSFETs for highER current applications. The opERating frequency is selected by an extERnal resistor and is compensated for variations in VIN and can also be synchronized to an extERnal clock for switching-noise sensitive applications. Integrated bias control genERates gate drive powER from the input supply during start-up and when an output shortcircuit occurs, with the addition of a small extERnal SOT23 MOSFET. When in regulation, powER is dERived from the output for highER effi ciency.
上传时间： 2013-10-24
上传用户：wd450412225
While simplicity and high effi ciency (for cool running) areno longER optional features in isolated powER supplies, itis traditionally diffi cult to achieve both. Achieving higheffi ciency often requires the use of advanced topologiesand home-brewed secondary synchronous rectifi cationschemes once resERved only for highER powER applications.This only adds to the parts count and to the designcomplexity associated with the refERence and optocouplERcircuits typically used to maintain isolation. Fortunately, abreakthrough IC makes it possible to achieve both high efficiency and simplicity in a synchronous fl yback topology.The LT®3825 simplifi es and improves the pERformance oflow voltage, high current fl yback supplies by providingprecise synchronous rectifi ER timing and eliminating theneed for optocouplER feedback while maintaining excellentregulation and supERior loop response.
上传时间： 2013-10-16
上传用户：wayne595
Video cable drivER amplifi ER output stages traditionallyrequire a supply voltage of at least 6V in ordER to providethe required output swing. This requirement is usuallymet with 5V supplies by adding a boost regulator or asmall local negative rail, say via the popular LT®1983-3.Such additional circuitry is unnecessary in typical 1VP-Pvideo connections, such as HD component video, if thecable drivER amplifi ERs simply offER near rail-to-rail outputcapability when powERed from 5V.
上传时间： 2013-11-16
上传用户：yanyangtian
Avalanche photo diode (APD) receivER modules arewidely used in fi bER optic communication systems. AnAPD module contains the APD and a signal conditioningamplifi ER, but is not completely self contained. It stillrequires signifi cant support circuitry including a highvoltage, low noise powER supply and a precision currentmonitor to indicate the signal strength. The challenge issqueezing this support circuitry into applications withlimited board space. The LT®3482 addresses this challengeby integrating a monolithic DC/DC step-up convERtER andan accurate current monitor. The LT3482 can supportup to a 90V APD bias voltage, and the current monitorprovides bettER than 10% accuracy ovER four decades ofdynamic range (250nA to 2.5mA).
上传时间： 2014-01-18
上传用户：wenyuoo
TDK公司的子公司TDK-EPC推出了爱普科斯PQ铁氧体磁芯的扩展系列。新加入了PQ40/40和PQ50/50磁芯后，PQ磁芯系列覆盖了PQ16/11.6至PQ50/50的全部尺寸。 PQ磁芯专为开关电源的变压器研制。这些磁芯的插入高度可以调节，同时可以通过适当调整磁芯保存相同的占用面积。新款铁氧体磁芯可用于AC/DC和DC/DC转换器中的标准绕线变压器以及平面变压器。 与传统ETD/ER/E磁芯设计相比，PQ磁芯的主要优势在于拥有稳定的圆形中心支脚和更大的外表面。凭借该圆形中心支脚和更大的绕组表面积，铜线的长度得以缩短。因此，变压器生产的成本也得以降低。此外，更大的外表面可以保证更好的散热。PQ磁芯外形经过优化，从而可以更小的尺寸和重量获得与e磁芯相同的变压器性能。PQ磁芯可由多种铁氧体材料制成，如：N49、N51、N87、N92、N95和N97。
上传时间： 2013-11-10
上传用户：zgu489
此系统是一个专门为一个童装行业客户做的。。“产品”进销存系统，只是对产品，没有对原料。。。 系统模块主要分 基本资料 _客户资料 _产品资料 _产品组别 _款式资料 ...... 业务管理 _成品入库 _生产退货 _客户送货 -客户退货 _....... 报表统计 -销售情况 _进销存日报 .... 系统管理 _用户管理 _.... 其中....没有写出来，，请下载后自己后。。 后台数据库用的是ER/studio设计,先写成C/S结构,等完成了后，(拿到MONEY后)就将其加进原料进销存...生产管理..等，请各位关注，，并提出建议......谢谢!
标签： 进销存系统
上传时间： 2015-03-14
上传用户：gaojiao1999
Nand Flash Translation LayER 用于nandflash的操作。 bad block memory map garbage collection avERage ERase
标签： Translation collection nandflash avERage
上传时间： 2014-07-02
上传用户：lingzhichao
试题库管理系统的需求规格说明文挡，包括详细的需求分析，ER图分析等内容。
上传时间： 2015-10-14
上传用户：gundamwzc
网络考试系统旨在实现考试的无纸化管理，对一些科目的考试可以通过互联网络或局域网进行，方便校方考务的管理，也方便了考生，尤其适合考生分布广，不易集中的远程教育。本系统包括系统管理、考生管理、在线考试、在线制作试卷、控制学生考试、试卷审批中心等功能。本论文主要介绍了系统的分析，设计和开发的全部过程。运用数据流图，ER图，程序流程图等对系统的设计过程进行详细的说明。全文共分为前言、需求分析、系统设计、开发技术、关键技术解决，结论六部分。西统采用B/S开发模式，开发工具选择JAVA、JSP、Javas cript、Html语言，采用Tomcat服务器技术，后台数据库选用SQL SERvER 2000。
上传时间： 2013-12-20
上传用户：iswlkje
This papER examines the asymptotic (large sample) pERformance of a family of non-data aided feedforward (NDA FF) nonlinear least-squares (NLS) type carriER frequency estimators for burst-mode phase shift keying (PSK) modulations transmitted through AWGN and flat Ricean-fading channels. The asymptotic pERformance of these estimators is established in closed-form expression and compared with the modified Cram`ER-Rao bound (MCRB). A best linear unbiased estimator (BLUE), which exhibits the lowest asymptotic variance within the family of NDA FF NLS-type estimators, is also proposed.
标签： pERformance asymptotic examines non-data
上传时间： 2015-12-30
上传用户：225588
